For the Man Group PyData 2022 (https://github.com/man-group/pydata2022)
All options are for the underlying GOOG and with expiry date 2022-05-19
Based on the in the money column, the underlying price is between 2200 USD (max strike of calls in the money) and 2250 USD (min strike of calls out of the money)
The Premium % Change is mainly positive for Puts, and mainly negative for Calls.
The premium for Puts are raising in the last days (2021-12-30 to 2022-01-05)
Last trade date in the data 2022-01-05
I believe that from the lastTradeDate and change columns, one can infer when the dataset was extracted.